參數(shù)資料
型號(hào)： MPC8272ZQTIEX
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 400 MHz, RISC PROCESSOR, PBGA516
封裝： 27 X 27 MM, 1 MM PITCH, LEAD FREE, PLASTIC, MS-034AAL-1, BGA-516
文件頁(yè)數(shù)： 4/60頁(yè)
文件大?。?/td> 746K
代理商： MPC8272ZQTIEX
MPC8272 PowerQUICC II Family Hardware Specifications, Rev. 2
12
Freescale Semiconductor
Thermal Characteristics
4
Thermal Characteristics
Table 6 describes thermal characteristics. Refer to Table 2 for information on a given device’s package.
Discussions of each characteristic are provided in sections 4.1 through 4.7. For the these discussions,
PD =(VDD × IDD) + PI/O, where PI/O is the power dissipation of the I/O drivers.
4.1
Estimation with Junction-to-Ambient Thermal Resistance
An estimation of the chip junction temperature, TJ, in C can be obtained from the equation:
TJ = TA + (RθJA × PD)
where:
TA = ambient temperature (C)
RθJA = package junction-to-ambient thermal resistance (C/W)
PD = power dissipation in package
The junction-to-ambient thermal resistance is an industry standard value which provides a quick and easy
estimation of thermal performance. However, the answer is only an estimate; test cases have demonstrated
that errors of a factor of two (in the quantity TJ – TA) are possible.
4.2
Estimation with Junction-to-Case Thermal Resistance
Historically, the thermal resistance has frequently been expressed as the sum of a junction-to-case thermal
resistance and a case-to-ambient thermal resistance:
5
MPC8272 and MPC8271 only.
Table 6. Thermal Characteristics
Characteristic
Symbol
Value
Unit
Air Flow
Junction-to-ambient—
single-layer board 1
1
Assumes no thermal vias
RθJA
27
°C/W
Natural convection
21
1 m/s
Junction-to-ambient—
four-layer board
RθJA
19
°C/W
Natural convection
16
1 m/s
Junction-to-board 2
2
Thermal resistance between the die and the printed circuit board per JEDEC JESD51-8. Board temperature is
measured on the top surface of the board near the package.
RθJB
11
°C/W
—
Junction-to-case 3
3
Thermal resistance between the die and the case top surface as measured by the cold plate method (MIL SPEC-883
Method 1012.1).
RθJC
8
°C/W
—
Junction-to-package top 4
4
Thermal characterization parameter indicating the temperature difference between package top and the junction
temperature per JEDEC JESD51-2. When Greek letters are not available, the thermal characterization parameter is
written as Psi-JT.
RθJT
2
°C/W
—
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